There no ghosts, so he has no case.
This wasn’t a fake ghost though. It was a chain saw, chainless but perhaps in the surprise not immediately apparently so. Guests are probably officially forbidden from being armed there, but we know how many slips occur between the cup and the lip. “Horror show over!” “Rev rev rev vroom vroom vroom chase chase chase” “Bang!” (not that I am EVER advocating that anyone PURPOSES this) might get them to rethink that.